The Faucet Parts by Zurn Industries: 1/2 FNPT AquaGard Thermostatic Mixing Valve, installs at the potable water heat source, inlet strainers and check valves included, low-lead law compliant, 5 7/16 x 3 3/8 x 5 1/4 ( Zurn Industries - 12-ZW1017XL )